<script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.js"></script>
<script src="https://cdn.bootcss.com/jquery_lazyload/1.9.7/jquery.lazyload.js"></script>

<!-- 使用格式 -->
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/>
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<img class="lazy" alt="" width="640" height="480" 
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/>

<script>
/* 调用插件*/
$(function() {
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});
</script>